Thanks for checking it out! Let me know if you can't make out what they're saying and that's where you're stuck. But here's a hint:
There is a missing word from what the female voice is saying - what word could that be?
The male voice says numbers in response to each photo. If you know what the missing word is, you can work out from these numbers the order of buttons to press.
The other clue you need comes from the male voice saying, "Normally I would say six, but this one only has FIVE."
This is also a clue about the sequence of button presses.